Hi Thrasher DIY Forum, i'm currently trying to persuade my parents into sponsoring a concrete skatepark in my backyard, since i live in Denmark and there aren't any skateparks in my town. I'm going to build it myself, but i should have all information about the building project ready, before they will pay for the concrete. Therefore i'm asking out here:What is the concrete to water ratio to get smooth concrete like the one in skateparks?And how much concrete powder do i need to fill up an cubic space of 1450*440*5cm = 3190000cm3 / 3,19m3 / 570,87*173,23*1,97 inches = 194816,87 cubic inches / 112,74 cubic feet / 3192,5L with shred-ready concrete?